** Boab Metals BML.AX soars as much as 19.2% to A$0.155, highest since Nov. 6
** Precious metals miner's unit executes $30 mln binding offtake agreement with leading logistics giant Trafigura Asia
** Funds will be used to build and develop the flagship Sorby Hills Lead-Silver-Zinc project in Western Australia - BML
** Stock posts biggest intraday percentage gain since Oct. 21
** Around 1.6 mln shares traded vs the 30-day avg of 501,700 in stock's busiest day since Oct. 30
** BML down 21.2% this year, as of last close
(Reporting by Nichiket Sunil in Bengaluru)
((Nichiket.Sunil@thomsonreuters.com))